At a Neolithic town site in the Fertile Crescent, archeologists found seeds from more than a hundred plant species. These seeds represented a cumulative knowledge of edible plants that had been tested and handed down from generation to generation, and would ultimately pave the way for civilisation. This was culturally transmitted knowledge, accepted by each new generation on human testimony.

The same can be said for a number of things; faith – or whether gay marriage is a good idea, to name but a couple.